Two-coordinate magnesium(I) dimers stabilized by super bulky amido ligands

Aaron J. Boutland, Deepak Dange, Christos E. Kefalidis, Andreas Stasch, Laurent Maron, Cameron Jones

Research output: Contribution to journalArticlepeer-review

58 Citations (Scopus)

Abstract

A variety of very bulky amido magnesium iodide complexes, LMgI(solvent)0/1 and [LMg(μ-I)(solvent)0/1]2 (L=-N(Ar)(SiR3); Ar=C6H2{C(H)Ph2}2R′-2,6,4; R=Me, Pri, Ph, or OBut; R′=Pri or Me) have been prepared by three synthetic routes. Structurally characterized examples of these materials include the first unsolvated amido magnesium halide complexes, such as [LMg(μ-I)]2 (R=Me, R′=Pri). Reductions of several such complexes with KC8 in the absence of coordinating solvents have afforded the first two-coordinate magnesium(I) dimers, LMg−MgL (R=Me, Pri or Ph; R′=Pri, or Me), in low to good yields. Reductions of two of the precursor complexes in the presence of THF have given the related THF adduct complexes, L(THF)Mg−Mg(THF)L (R=Me; R′=Pri) and LMg−Mg(THF)L (R=Pri; R′=Me) in trace yields. The X-ray crystal structures of all magnesium(I) complexes were obtained. DFT calculations on the unsolvated examples reveal their Mg−Mg bonds to be covalent and of high s-character, while Ph⋅⋅⋅Mg bonding interactions in the compounds were found to be weak at best.
Original languageEnglish
Pages (from-to)9239–9243
JournalAngewandte Chemie International Edition
Volume55
Issue number32
Early online date15 Jun 2016
DOIs
Publication statusPublished - 1 Aug 2016

Keywords

  • Bulky amides
  • DFT calculations
  • Magnesium(I)
  • Metal–metal bonding

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